Abstract: To study space-charge forces influence on beam transport in dipole magnet field, the matrix method was applied to analyze the transport matrices in dipole magnet field of non-intense pulsed beam and intense pulsed beam theoretically, and a computer code was programmed for the pulsed beam transporting in dipole magnet field. Powell optimization techniques were used to calculate non-intense pulsed beam for attaining the given optical conditions and iteration procedures were adopted to compute intense pulsed beam for obtaining self-consistent solutions in this computer code. The calculations were made by using the code and other codes under the condition of different beam current, and the simulation results were compared and analyzed. The results show that greater beam current causes more apparent beam envelope lateral divergence and more powerful space-charge effect.